Pages

Limitation of amplitude modulation

Disadvantages of amplitude modulation are many and they are stated below -

This type of transmission can be affected by natural sources of radiation. It can lead to electromagnetic interference. This may lead to disruption of the original signal or distortion.

This type of transmission is also affected by the man made noises or radiations like waves from other antennas or channels.

It cannot be used for transmitting music as done by FM.

It can only be used for sports talks etc.

Now we know that the carrier signal does not have any information that is transmitted and which is the entire reason for modulation. But in Amplitude modulation we have almost two third of the energy or power is in carrier waves. We can reduce this by cutting the carrier wave but then we have to have complex receiver equipment. Having such equipment is again costly. Hence serves no purpose.

In this type of modulation, for one transmitter we will have many corresponding receivers which further increase the cost.

It cannot be used for transmission of sensitive information like in army etc. where loss or disruption or interpretation during transmission is not an option.

All the above can lead to a bad overall and soppier transmission.

The bands in which this type of modulation is used is also low that means it is used in low frequency transmission.

It is again important to note that whatever we are doing in this type of transmission is the information present in sidebands. That is all the information is present in the sidebands. And all the power is used by the carrier waves.